Scilab Function
Last update : 28/6/2004

fplot3d1 - 3D gray or color level plot of a surface defined by a function

### Calling Sequence

  `fplot3d1(xr,yr,f,[theta,alpha,leg,flag,ebox])`
  `fplot3d1(xr,yr,f,<opt_args>)`

### Parameters

- `xr`: row vector of size n1.
- `yr`: row vector of size n2.
- `f`: external of type z=f(x,y).
- `theta,alpha,leg,flag,ebox`: see `plot3d1`.
- `<opt_args>`: see `plot3d`.

### Description

`fplot3d1` plots a 3D gray or color level plot of a surface defined by the external function `f` on the grid defined by `xr` and `yr`.

Enter the command `fplot3d1()` to see a demo.

### Examples

    deff('z=f(x,y)','z=x^4-y^4')
    x=-3:0.2:3 ;y=x ;
    clf() ;fplot3d1(x,y,f,alpha=5,theta=31)

### See Also

`plot3d1`,

### Author

J.Ph.C.